first attempt to formalize graph dependencies

[olinux]

Hello,
As discussed previously, we need a way on how to formalize the dependencies of various properties in the graph so tools (such as the KG Editor and validation mechanisms) can make use of it. This is a first attempt to do so -> the syntax is kept close to JSON-LD as well as the EBRAINS KG query language

[lzehl]

@olinux thanks for starting to tackle this. Can you explain the syntax you used a bit more though? I have the feeling we should simplify it a bit more for the openMINDS syntax (if possible). Let me know if you want to set up a meeting to discuss this (might be easier than explaining/discussing it here).

[olinux]

I do agree that this is slightly more complex than the definition of properties, but I also assume, that this is something which isn't handled by the majority of contributors but rather a few "experts". I think it's easier to go through this in a meeting to explain the thoughts behind it.